* {
  margin: 0;
  padding: 0;
}
ul,
ol,
li {
  list-style: none;
}
a,
a:hover,
a:target,
a:link,
a:active {
  text-decoration: none;
  color: #333;
}
img {
  width: 100%;
  height: 100%;
  display: block;
}
.container {
  width: 1200px;
  margin: 0 auto;
}
.header {
  height: 60px;
  color: #000;
  font-size: 4ch;
  font-weight: 700;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}
.header > p {
  position: absolute;
  font-size: 18px;
  left: 20px;
  font-weight: 500;
  display: none;
}
.header > p.active {
  display: block;
}
.header > p > button {
  cursor: pointer;
  padding: 3px 10px;
}
.header > p > a {
  color: #aaa;
}

.footer {
  height: 300px;
  background-color: yellowgreen;
  display: flex;
  font-size: 100px;
  color: #fff;
  justify-content: center;
  align-items: center;
}
